Floor tiles lifted on calcium based self level floor

[LM]

I think I made a thread about cemfloor last year Lee and there claims about you can tile if after a week and no need to send it, load of nonsense. The one I tiled didn't crack and it was perfectly flat.

Have you got a link to that thread Andy?

 

[Flintstone]

Water UFH - Cemfloor liquid screed with heating - https://www.tilersforums.com/threads/cemfloor-liquid-screed-with-heating.86178/

Here it is Lee.

 

[LM]

Water UFH - Cemfloor liquid screed with heating - https://www.tilersforums.com/threads/cemfloor-liquid-screed-with-heating.86178/

Here it is Lee.

Yes I remember it now obviously

 

[Timmy Mcguire]

I've come across cemfloor screed on quite a few projects in the last year and I haven't had any issues yet when tiling onto it. Has anyone here heard any horror stories??
I've phoned them a couple of times asking to explain the drying times and they said because its cement based it doesn't need to be dried out fully before tiles are installed since moisture will not effect its strength. The most important factors are that most of the shrinkage has occurred and if there UFH that it has been commissioned.
I phoned BAL and asked them and they confirmed this; they also said that their Green Screed adhesive can be used to tile onto cemfloor after 7-days if there is no UFH in the screed.

 

[Flintstone]

There aren't many liquid screeds these days without underfloor heating.

 

[Dumbo]

I've come across cemfloor screed on quite a few projects in the last year and I haven't had any issues yet when tiling onto it. Has anyone here heard any horror stories??
I've phoned them a couple of times asking to explain the drying times and they said because its cement based it doesn't need to be dried out fully before tiles are installed since moisture will not effect its strength. The most important factors are that most of the shrinkage has occurred and if there UFH that it has been commissioned.
I phoned BAL and asked them and they confirmed this; they also said that their Green Screed adhesive can be used to tile onto cemfloor after 7-days if there is no UFH in the screed.

Did they not give you an rh figure.

 

[ray the tiler]

having used bals flex bone i do believe this product is the future for any floors layed with anhydrite or cement its a no brainer for me these days no more sanding no more worries about how wet the screed is just roll it out and tile

 

[marbleman]

recommend Easy Screed best liquid screed company we have ever come across been dealing with liquid screeds for 25 years and most don’t care over water the product , or pour it at incorrect thickness so it never dries out . Always make sure it’s pre heated and then we test the floor making sure it’s 75% humidity or 0.5% moisture if not don’t touch it

 

[ray coates]

Hi all,my tiler fitted 600x600 porceline tiles to my calcium based concrete slab,it was 4 months after it being poured and he did a test by laying a peice of polythene taped around edges to see if it was still emiting moisture,this was after it was professionally sanded sorry and no moisture was detected,
He proceeded to seal the floor with norcos prime bond (duck egg green colour) the day before and layed tiles with decent Weber adhesive which I supplied,
Few month after moving in and building heat up gradually I heard crackling sound,I’ve now lifted every tile with a sucker leaving the floor perfectly clean,no adhesive has stuck apart from a hand sized area around a door post and beside back door,
On backs of tiles shows signs of a green colour like the bonding norcos primer,can any one help to what has happened as tiler at a loss as well

o m g where is that a proper moisture test the guys a idiot and you fell for it. the floor has not been properly tested and the calcium has reacted with the adhesive you supplied.
the only adhesive that will stick tiles to a calcium floor direct is a calcium based adhesive.
how many coats of primer did it have. it should of had 3 in my opinion i would of also used a decoupling mat.

 

[Huddersfield Tiling]

Hi all,my tiler fitted 600x600 porceline tiles to my calcium based concrete slab,it was 4 months after it being poured and he did a test by laying a peice of polythene taped around edges to see if it was still emiting moisture,this was after it was professionally sanded sorry and no moisture was detected,
He proceeded to seal the floor with norcos prime bond (duck egg green colour) the day before and layed tiles with decent Weber adhesive which I supplied,
Few month after moving in and building heat up gradually I heard crackling sound,I’ve now lifted every tile with a sucker leaving the floor perfectly clean,no adhesive has stuck apart from a hand sized area around a door post and beside back door,
On backs of tiles shows signs of a green colour like the bonding norcos primer,can any one help to what has happened as tiler at a loss as well

If I was in your position, as you seem to have followed curing times and correct commissioning routine:
I'd firstly question the priming and adhesive selection, then if all that is in order, it might come down to the incorrect mixing ratios of the initial screed or tile adhesive.
It's not uncommon for floor screeders to water-down the mix in order to save money, but a tiler would not be able to work with a sloppy mix.
Incorrect and weak floor screed mixtures are incredibly problematic for tiling installations.
Just a thought.